Well fishing tool



Dec.2, 1924. 1,517,426

R. W. HICKMAN WELL FISHING TOOL Filed Sept. 22, 1923 an mentor R MJ I AQXrnaK Patented Dec. 2, 1924.

fireman, or OKLAHOMA CITY, omenomwnLL rrsnme root.

Application fil ed September 22, 1923. S eria1No.6 64, 214.

To all; whom it may concern: Be it known that Ross W. HIGKMAN,

- citizen of the United States, residing at specification.

tool and it has for its Oklahoma City; in the county of Oklahoma and State of Oklahoma, has invented certain new'and useful Improvements in Well Fishing Tools,

This invention'relates'to a well fishing objectto provide an 2 improved device of this character bymeans alongv with the has been found to be of 1\ivhich lost tools'mlay be fished' from; deep] 1 It is a weH known fact that many of the fishing tools heretofore proposed for this purpose have functioned well-enough in so far as'grasping {the lost tool is concerned Lbutit has frequently beenthe case that it impossible to dislod w fishing tool is so constructed that it cannot-release its hold upon the lost tool then the fishing tool is irretrievably lost tool that it is sought to re- I p p collar 22, of stem 12 andithe side walls ofthe shank, but is capable of being sheared off under certain conditions as will; be presently fsetforth. 1 The operation of the 'deviceis as jfollo'wsp' If it be desired to retrieve a lost tool from a -well the gripping elements 6 areadju'sted p to the approximate diameter of the lost tool cover and, in addition, the well is so obstructed that further efforts to retrieve the lost tool are rendered futile. i c

The novel features of construction of the present invention will be more specifically set forth .in the detailed description which follows. 7 1

In the accompanying drawing:

Fig. 1 is a view. partly inelevation and partly in section of-a fishing tool constructed in accordance with the invention; and

Fig. 2 is a vertical sectional viewupon line 2-2 of Fig. 1.

Like numerals designate corresponding parts in both of the figures of the drawing.

In the drawing ;1 represents the shankof the fishing tool. This'shank is cylindrical in form and its upper end is provided with a standard tool oint.- The shank is further provided with a squared'portion 2 for the reception of a wrench or like tool. At its lower end the cylindrical shank is beveled,"as indicated at 3, to facilitate the entry of the lost tool into said shank; The sides of the shank are slotted, as indicated at 4 and 5, and in these slotted portions the gripping members 6 are disposed. These grpping member are of spring material,

of which the fol'lowin'gis a p x p by a bolt "11 and by this bolt are rendered tightened it is e the lost-tool and in those cases if the I shank so that if these gripping elementsbe vertically adjustable with I'GSPGCEJTO a stem '12, the bolt being movable in a slot 13' of the 10st tool formed in said stem. When a ,-nut 14' is l v providing the slot 13 as set forth". The-stem 12 pin 18. The lower end of the spring bears "upon a collar 19 whichissupported from the shank b means of screws 20. Thelstemf 12 is capa le of limited fslidingjmovement I manifest that the gripping elements will be boundito the lower end of the stem and that the point of binding may H I be varied within a limited range by through the collar 19. A pin 21 traverses a which is.generally known. Thisis effected by loosening nut 14 and adjusting the gripping jaws'6 upwardly ordownwardly, as the case may be, in slot 13. These jaws tend to spring apartunder their own spring action permanent by tightening the nut 14. The

foregoing operation of adjustment is effected through the slots 4 and 1s carried out with the pin 21 in place. With the pin 21 in place the spring 15 is under compression, the washer 14 having been moved toward collar 19. .The tool is lowered into the well and its flared lower end guides the'lost tool into the;

interior of the shank and as this lost toolis forced upwardly between the toothed jaws 9,

the teeth of said jaws engage with the tool in such manner that withdrawal of the fishing .tool will usually result in bringing the lost tool with it. However, it is sometimes the shank. I the jaws moving apart and releasing thelost shank.

case that no amount of jerking or pulling will succeed'in dislodging the 0st tool and under these circumstances the fishing tool must be released from the lost tool or otherwise the fishing tool will itself be lost and the well will be additionally obstructed by its presence. Under these circumstances the pin 21 is sheared off by weight or force applied vertically to the shank and this permits the spring 15 to act to move the jaws 6 vertically with res ect to the inclined teeth 8 upon the t is manifest that this will result in tool whereupon the fishing tool may be removed from the well.

Attention is directed to the fact that under the present construction the spring 15 ishoused in such manner that it is protected,

from mud and water and that the construction is a very simple and inexpensive one in that the spring 15 encircles the stem 12 and is entirely separate from the jaws 6. v

It is to be understood that the invention is not limited to the forth but thatit inc whatever changes fairly come within either 1precise construction set udes w1th1n its purvlew' sheared ofi' traversing the stem and shank and gripping jaws vertically adjustable with re- "spect to the stem independently of the movement of said stem under the influence of the spring, or of the shank with respect to the s em.-

3. A structure as 'recited in claim 2 wherein said gripping jaws and the shank are provided with coactin inclined surfaces by which said jaws are orced toward each other a i'they move downwardly with respect to the I 4. In a device of: the characterdescribed the combination with a shank, of a'collar car ried by the same, a stem movable through,

said collar, a spring bearing upon said collar and elements carried by the stem'against which said spring bears, a pin adapted to be sheared off traversing the stem and shank, a pair of gripping jaws having toothed inner faces and inclined outer. faces, inclined faces upon the stem with which inclined outerfaces of the jaws co act and a bolt. traversing the upper ends of the jaws at the" the terms or the spirit of the appended claims. flower end of the stem, said bolt being verti- Having described my invention what I claim is:

1; The combination with a cylindrical ihank, of a stem capable of movement therein,

an element carried by the shank, an element carried by the stem, a spring bearing between said elements, means for holding t e spring under compression and gripping jaws carried by the stem and adjustable toward and from each other independent of the movement of the stem under the influence of the spring,

orjofsthe shank with respect to the stem.

. a device ofthe character described :the combination with a shank, of a collar car ,ried by the same, a stem movable through ment of the stem under the action of the spring.

r In testimony whereofI afiixed my signa- 0 him in the presence oftwo witnesses.

ROSS W. 'HICKMAN.

Witnesses:

Nnmzmn G. Brmnorm, Ron'r. K; ERNEST. 

